import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
//1.引入element-plus组件库与其样式
import ElementPlus, {ElMessage} from 'element-plus'
import 'element-plus/dist/index.css'
//2.引入element-plus图标库,并起别名为ElementPlusIconsVue
import * as ElementPlusIconsVue from '@element-plus/icons-vue'
//6.1修改elementPlus默认中文
import zhCn from 'element-plus/dist/locale/zh-cn.mjs'

const app = createApp(App)/* 创建vue实例,并起名为app */
//3.将所有导入的图标组件变为键值对数组,并依次遍历取出每一个图标组件[key, component]
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
	// 4.将当前遍历到的图标组件注册为当前vue实例的全局组件
	app.component(key, component)
}
//5.为前vue实例应用element-plus组件库
//6.2 app.use(ElementPlus,{ locale: zhCn })将El本地化为中文
app.use(ElementPlus,{ locale: zhCn }).use(store).use(router).mount('#app')

//7.解决ResizeObserver Error
const debounce = (fn, delay) => {
	let timer = null;
	return function () {
		let context = this;
		let args = arguments;
		clearTimeout(timer);
		timer = setTimeout(function () {
			fn.apply(context, args);
		}, delay);
	}
}
const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {
	constructor(callback) {
		callback = debounce(callback, 16);
		super(callback);
	}
}

// 8.定义全局方法，获取当前登录的用户数据
window.getUser = () => {
	return localStorage.user ? JSON.parse(localStorage.user) : null;
}
//9.配置路由守卫
router.beforeEach((to, from, next) => {
	//获取当前登录的用户数据
	let user = localStorage.user;
	//登录了,就放行,没登录提示用户并跳转至登录页
	if(to.path!=='/login' && !user){//去的不是登录页 且 没登录
		next({path:'/login'},ElMessage.error('请先登录!'));
	}else{
		next();
	}
})


